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[Chemical Knowledge]：Production and manufacturing method and process of 2-octanol

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The manufacturing method
of 2-octanol
1. Introduction

2-octanol is an important organic chemical raw material, widely used in fine chemicals, medicine, spices and other fields. Due to its unique chemical properties and wide applications, it is of great practical significance to study the manufacturing methods of 2-octanol. This paper will introduce in detail the process route of preparing 2-octanol by aldehyde condensation method with ethylene as raw material, including reaction principle, process flow, equipment selection and so on.

2. reaction principle

aldehyde condensation method to prepare 2-octanol reaction principle mainly includes two steps: first, ethylene and synthesis gas (CO and H2) under the action of catalyst, the carbonyl synthesis reaction to produce propionaldehyde; Then, propionaldehyde and n-butyraldehyde under the action of acid catalyst, the condensation reaction to produce 2-octanol.

3. Process

1. Ethylene Oxo Synthesis Propionaldehyde

Ethylene and synthesis gas in accordance with a certain proportion of mixed, into the reactor with catalyst, in the appropriate temperature and pressure conditions for the carbonyl synthesis reaction, the generation of propionaldehyde. The reaction product was cooled and separated to obtain crude propionaldehyde.

2. Condensation of propionaldehyde with n-butyraldehyde to generate 2-octanol

After mixing crude propionaldehyde with n-butyraldehyde in a certain proportion, an acidic catalyst is added and the condensation reaction is carried out at a suitable temperature to generate 2-octanol. After the reaction product is distilled and separated, a 2-octanol product is obtained.

4. equipment selection

1. Reactor

Selection of fixed bed reactor for ethylene carbonyl synthesis of propionaldehyde reaction, catalyst using rhodium-based catalyst. The reactor is equipped with a temperature control system and a pressure control system to ensure the stability of the reaction conditions.

2. distillation column

selection of plate distillation column for the separation and purification of reaction products, in order to achieve the separation of crude propionaldehyde and 2-octanol products. The distillation column is equipped with a temperature and pressure control system to ensure the stability of the separation effect and the purity of the product.

5. operating conditions and optimization of

1. Temperature

In the reaction of ethylene carbonyl synthesis of propanal, the appropriate reaction temperature is 120-150 ℃; in the reaction of propanal and n-butyraldehyde condensation to produce 2-octanol, the appropriate reaction temperature is 80-100 ℃. By controlling the reaction temperature, the reaction rate and selectivity can be improved.

2. Pressure

In the reaction of ethylene carbonyl synthesis of propionaldehyde, the suitable reaction pressure is 1.5-2.5MPa; in the reaction of propionaldehyde and n-butyraldehyde condensation to produce 2-octanol, the suitable reaction pressure is normal pressure. By controlling the reaction pressure, the reaction rate and equilibrium can be influenced.

3. Catalyst activity and life

The activity and life of the catalyst have a great influence on the reaction. Therefore, when selecting the catalyst, the performance of its activity, selectivity and life should be considered. At the same time, the catalyst needs to be regenerated or replaced periodically during operation to maintain its activity.

4. Raw material purity and ratio

The purity and ratio of raw materials also have a great influence on the reaction. Therefore, in the operation process, the purity and ratio of raw materials should be strictly controlled to ensure the smooth progress of the reaction and the quality of the product.

6. safety and environmental protection

in the production process, should strictly abide by the safety operation procedures to ensure production safety. At the same time, the treatment of waste gas, waste water and solid waste should be strengthened to reduce environmental pollution.

7. conclusion

aldehyde condensation method is a feasible process route for the preparation of 2-octanol, which has the advantages of mild reaction conditions, high selectivity and high product purity. In the actual production process, appropriate equipment and operating conditions should be selected according to the specific situation to improve production efficiency and product quality. At the same time, safety and environmental management should be strengthened to ensure the smooth progress of production and sustainable development.

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